a-weighting [](https://github.com/audiojs/a-weighting/actions/workflows/test.yml)

Standard frequency weighting curves (IEC 61672, ITU-R 468) for approximating equal-loudness contours of human ear.

Usage

import { a } from 'a-weighting'

// apply a-weighting to frequency spectrum
let weighted = frequencies.map((magnitude, i, data) => {
  let frequency = 22050 * i / data.length
  return a(frequency) * magnitude
})

Returns normalized 0..1 weight values, not decibels. To convert: 20 * Math.log10(weight).

Weights

Export	Standard	Description
a	A-weighting	General noise measurement
b	B-weighting	Moderate loudness
c	C-weighting	High loudness
d	D-weighting	Aircraft noise
m	ITU-R 468	Telecommunications
z	Z-weighting	Flat (unity gain)

See also

• audio-filter - Audio filters including IIR A/C/K weighting for sample processing.
• Equal-loudness contours

MIT · ॐ